Waterproof insulating board



E. S. PENN WATERPROOF INSULATING BOARD Dec. 5, 1933.

Filed Aug., 27. 1931 fly Z INVENTOR Zmdi PW tom 9' M s Patented Dec. 5, 1933 WATERPROOF INSULATING BQABE Everett S. Penn, Lancaster, Pa, assignor to Annstrong Cork Company, Lancaster, Pa, a corporation of Pennsylvania Application August 27, 1931. Serial No. 559,692

2 Claims.

My invention relates to a corkboard particularly adapted for use as insulation for milk cooling tanks. Most States require that milk be cooled to 50 F. on the farm. This necessitates the use of ice throughout the summer months.

Corkboard has long been recognized as the standard insulation for milk cooling tanks because of its low conductivity and natural resistance to moisture. However, when ice is used additional waterproof qualities must be provided to save the ice as much as possible.

It is an object of my invention to provide a waterproof corkboard which may be installed as insulation for mill; cooling tanks without the exercise of any particular degree of skill. It is a further object of my invention to apply an effective waterproofing medium to the surfaces of my insulating corkboard in an economical manner. It is a further object of my invention to produce to a waterproof insulating corkboard that will pos sess sumcient strength for use in any insulation construction. It is a further object of my invention to produce a waterproof insulating corkboard that will be durable and will retain its waterproof properties throughout the life of the corkboard. Other objects of my invention will become apparent upon reading the accompanying specification.

My invention is fully set forth in the annexed specification and the drawing forming a part thereof in which:

Figure l is a perspective diagrammatic view illustrating the method of ap lying the waterproof coating to the corkboard.

Figure 2 is a fragmentary perspective view of the waterproof corkboard.

in the drawing the corkboard is represented by the reference numeral 1. This corkboard is conventional and may be made in any suitable to size, depending upon the use to which the corkboard is to be put. The entire outer surface of the corkboard is covered with asphalt mastic 2 and cloth 3 at the factory. The mastic and cloth are ironed on to the corkboard by means of any suitable tool 4. The corkboard is run through a suitable coating machine and the surface to be waterproofed is covered with a coating of hot asphalt mastic. The fabric 3, which is preferably a loosely woven cotton fabric, is then placed on the layer of mastic before the mastic has had a chance to cool. The corkboard is then run through the coating machine again and a second coating of hot mastic is applied over the first coating and the fabric, and the mastic is then ironed to a smooth finish by means of the tool 4 which may be heated by any suitable means. Each surface of'the corkboard is then treated in the same manner.

I prefer to mount the iron 4 in a fixed position and to move the corkboard on a suitable conveyor under the iron. However, the board may be held stationary and the iron may be'moved over its surface to accomplish the same result. The ironing process may also be accomplished by passing the board and asphalt mastic through a suitable as pair of pressing rolls. The ironing process causes the mastic to flow through the interstices of the fabric and results in a strong integral waterproof coating for the corkboard. The ironing process also strengthens the bond between the asphalt if) and the corkboard. The asphalt mastic will adhere to the corkboard for the life of the insulation. The ironing process also assures a smooth outer surface for the board.

Although I prefer to use a loosely woven cotton i5 fabric as my reinforcement, any fabric having interstices large enough to permit flow of the hot mastic therethrough will serve the purpose. The fabric protects the corkboard from abrasion or injury at the time of installation.

My improved corkboard eliminates application of asphalt to the insulating material on the job. The application of a mastic at the factory results in a better waterproof finish than can be obtained by the average workman. It is much more economical because the work can be done in quantity at the factory and only a few blocks can be done at most construction jobs. The application of the mastic and cloth at the factory has a further advantage in that it provides the corkboard with reinforcement during the shipping and handling stages. The waterproofed corkboards are strong, rigid and easy to handle. The reinforcement minimizes breakage and reduces waste.

Although I have described my invention with particular reference to use as insulation for a milk cooling tank, it will be understood that a waterproofed corkboard may be used in any type of insulation construction Where resistance to 1 water or moisture is desired.

I claim:

1. A waterproof and abrasion resisting insulating unit comprising an insulating corkboard enclosed in'a waterproof reenforcing envelope, said envelope including fabric substantially coextensive with the surface of the corkboard, a continuous imperforate layer of asphalt mastic bonding said fabric and said corkboard, and a continuous imperforate layer of asphalt mastic overthe interstices of the fabric reenforcing layer and cooperating to form an imperforate continuous waterproof envelope enclosing said corkboard, one of said mastic layers being bonded to said corkboard and serving to bond the fabric layer and the other of said mastic layers thereto.

EVERETT s. PENN. 

